What it is
The parathyroid glands are tiny glands in the neck, next to the thyroid. In a healthy dog they release their hormone only when blood calcium drops, and stop once there is enough again. In primary hyperparathyroidism one gland enlarges and keeps releasing the hormone regardless, so calcium is drawn from the bones and held back by the kidneys. Raised calcium makes the kidneys less able to concentrate urine, which is why the dog drinks and pees more.
The condition is linked to age and appears in middle-aged and older dogs; an inherited form is known as well.
The changes come on slowly, so you may only notice that your dog drinks a little more or seems quieter. Keep fresh water within reach, offer plenty of chances to go out, and watch for straining or blood in the urine, as raised calcium can encourage bladder stones.
Signs you may notice
- Drinks more than before
- Pees more
- Quieter and tires sooner
- Eats less
- Straining or blood when peeing
- Muscle weakness or shivering
A dog may drink more and need to pee more, become sluggish and weaker, and eat less. Some dogs show blood in the urine or strain to pass it.
When to see a vet
Book a visit if your dog starts drinking or peeing more, seems quieter or eats less. If it strains to pee but passes little or nothing, see a vet immediately.
This is general information, not veterinary advice. For your own dog's health, tests and treatment, see a vet.